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See detailThe evaluation of unmanned aerial systems-based photogrammetry and terrestrial laser scanning to generate DEMs of agricultural watersheds
Ouedraogo, Mohamar ULg; Degré, Aurore ULg; Debouche, Charles ULg et al

in Geomorphology (2014)

Agricultural watersheds tend to be places of intensive farming activities that permanently modify their microtopography. The surface characteristics of the soil vary depending on the crops that are ... [more ▼]

Agricultural watersheds tend to be places of intensive farming activities that permanently modify their microtopography. The surface characteristics of the soil vary depending on the crops that are cultivated in these areas. Agricultural soil microtopography plays an important role in the quantification of runoff and sediment transport because the presence of crops, crop residues, furrows and ridges may impact the direction of water flow. To better assess such phenomena, 3-D reconstructions of high-resolution agricultural watershed topography is essential. Fine-resolution topographic data collection technologies can be used to discern highly detailed elevation variability in these areas. Knowledge of the strengths and weaknesses of existing technologies used for data collection on agricultural watersheds may be helpful in choosing an appropriate technology. This study assesses the suitability of terrestrial laser scanning (TLS) and unmanned aerial system (UAS) photogrammetry for collecting the fine-resolution topographic data required to generate accurate, high-resolution digital elevation models (DEMs) in a small watershed area (12 ha). Because of farming activity, 14 TLS scans (≈ 25 points m− 2) were collected without using high-definition surveying (HDS) targets, which are generally used to mesh adjacent scans. To evaluate the accuracy of the DEMs created from the TLS scan data, 1,098 ground control points (GCPs) were surveyed using a real time kinematic global positioning system (RTK-GPS). Linear regressions were then applied to each DEM to remove vertical errors from the TLS point elevations, errors caused by the non-perpendicularity of the scanner’s vertical axis to the local horizontal plane, and errors correlated with the distance to the scanner’s position. The scans were then meshed to generate a DEMTLS with a 1 × 1 m spatial resolution. The Agisoft PhotoScan and MicMac software packages were used to process the aerial photographs and generate a DEMPSC (Agisoft PhotoScan) and DEMMCM (MicMac), respectively, with spatial resolutions of 1 × 1 m. Comparing the DEMs with the 1,098 GCPs showed that the DEMTLS was the most accurate data product, with a root mean square error (RMSE) of 4.5 cm, followed by the DEMMCM and the DEMPSC, which had RMSE values of 9.0 and 13.9 cm, respectively. The DEMPSC had absolute errors along the border of the study area that ranged from 15.0 to 52.0 cm, indicating the presence of systematic errors. Although the derived DEMMCM was accurate, an error analysis along a transect showed that the errors in the DEMMCM data tended to increase in areas of lower elevation. Compared with TLS, UAS is a promising tool for data collection because of its flexibility and low operational cost. However, improvements are needed in the photogrammetric processing of the aerial photographs to remove non-linear distortions. [less ▲]

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See detailÉlaboration du référentiel de compétences du master bioingénieur en Sciences et Technologies de l'Environnement
Colaux-Castillo-Bocanegra, Catherine ULg; Colinet, Gilles ULg; Debouche, Charles ULg et al

in Poulin, Richard (Ed.) Séminaire CITEF 2013 La liaison formation-emploi : l'approche compétences et la formation tout au long de la vie (2013, October 18)

Le département des Sciences et Technologies de l’Environnement (STE) de Gembloux Agro-Bio Tech faculté de l’Université de Liège a profité d’un changement d’intitulé de son diplôme de bioingénieur pour ... [more ▼]

Le département des Sciences et Technologies de l’Environnement (STE) de Gembloux Agro-Bio Tech faculté de l’Université de Liège a profité d’un changement d’intitulé de son diplôme de bioingénieur pour réviser son programme des études. Pour ce faire, il a adopté l’approche compétence. Afin de préparer au mieux ses futurs diplômés aux attentes du monde professionnel actuel et à venir, des anciens diplômés et des employeurs potentiels ont participé à la validation du référentiel de compétences associé à cette formation. Cette publication reprend les étapes clés de la création du référentiel de compétences et son exploitation dans la conception d’un programme des études cohérent. [less ▲]

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See detailLa réforme du master bioingénieur en Sciences et Technologies de l’Environnement par le biais des compétences
Debouche, Charles ULg

Scientific conference (2012, December 03)

Presentation of the method adopted to elaborate the referential of competences of the Master bioingénieur in Sciences and Technologies of the Environment and to reform the program of study of it

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See detailL’analyse du cycle de vie ou de l’intérêt d’une réflexion plus holistique pour soutenir le développement de systèmes de production plus durables
Debouche, Charles ULg

Scientific conference (2012, November 21)

Description de l'analyse du cycle de vie et de son apport dans le développement de systèmes de production plus durables

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See detailInfluence de l'état d'ameublissement et de la rugosité du sol des parcelles agricoles sur l'exactitude de l'altitude des points de contrôle positionnés au GPS
Ouedraogo, Mohamar ULg; Debouche, Charles ULg; Degre, Aurore ULg

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2012), 16(1), 33-44

Our goal in this study is to estimate through ranges of variation, the impact of agricultural parcels soil’s tilth and roughness, due to cultivation techniques, on the exactness of ground control points ... [more ▼]

Our goal in this study is to estimate through ranges of variation, the impact of agricultural parcels soil’s tilth and roughness, due to cultivation techniques, on the exactness of ground control points elevation surveyed by RTK (Real Time Kinematic) GPS (Global Positioning System). So, 16 point’s elevations which were located each 100 mm on a transect have been surveyed first by using a total station (TS), and then a RTK GPS in 2 parcels (3 transects per parcel). Cultivation techniques on those parcels were different. The parcel 1 was tilled, and the soil of parcel 2 was prepared for cereal cropping. Then, the analysis of variance has been applied on the differences of TS and RTK GPS elevations data to estimate the confidence interval of ground control points elevation due (i) to soil tilth, whereas the times series statistical method have been applied on elevation data to estimate the confidence interval due (ii) to soil roughness. The confidence intervals of points elevation are estimated being (i) [51 mm; 57 mm], (ii) [-4 mm; 4 mm] for parcel 1, and (i) [97 mm; 113 mm], (ii) [-35 mm; 23 mm], for parcel 2. Results show that ground control point’s elevations exactness is influenced by soil tilth and soil roughness. In conclusion, we can admit that soil tilth and soil roughness have significant impact on the exactness of ground control points located on agricultural parcels. This impact must be considered in DEM errors evaluation of agricultural watershed. [less ▲]

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See detailA methodology to assess the exactness of Stream Network modeling process on agricultural watersheds
Ouedraogo, Mohamar ULg; Degre, Aurore ULg; Beckers, Eléonore ULg et al

in Geophysical Research Abstracts (2011)

The goal of our study is to evaluate the exactness of stream network modeling process on agricultural watersheds. Agricultural watersheds topography is always changing, making it difficult to be modeled ... [more ▼]

The goal of our study is to evaluate the exactness of stream network modeling process on agricultural watersheds. Agricultural watersheds topography is always changing, making it difficult to be modeled. According to the standard ISO-7078 (ISO-7078, 1985) of the Inernational Organization of Standardization, the exactness of a measurement process or a modeled process can be defined as the difference between results obtained from the measurement process and a reference accepted as the «true value». A small watershed of a dozen hectares size has been surveyed by terrestrial LiDAR (Light Detecting And Ranging) scanner and photogrammetrical techniques to produce a row data of 30 cm resolution. Three interpolation techniques i.e. natural neighbourg, multiquadratic radial basis function and inverse distance weighted have been applied on the original data to create original digital elevation models (DEM) of 1 m resolution. RTK (Real Time Kinematics) GPS (Global Positionning System) ground control points have been surveyed on the watershed to evaluate DEM errors and fit a variogram that is used by a conditional sequencial gaussian simulation model to generate error maps. However, ground control point’s elevations accuracy is depending on the microtopography of parcels in an agricultural watershed. Depending on the crop that is planned by the farmer, the soil tillage will be different, and soil structure and roughness can considerably influence ground control point’s elevation. Analysis of variance and geostatistical methods have been applied on total station and RTK GPS data to estimate intervals in which, ground control points elevations vary. These intervals have been estimated for two parcels that soils are tilled in different ways. These errors are added to the generated errors maps to create final error maps. The final errors maps are added to the original DEM to create likely DEM realizations for the watershed (Temme and al., 2007). Then, two spurious sinks filtering methods (Colson 2006; Lindsay and Creed, 2005) and one flat area treatment method (Jenson and Domingue, 1988) are applied on each DEM realization for preprocessing. Finally, the three common flow direction extraction methods (D8, D-infity and Multiple Flow Direction) are applied on each preprocessed DEM to extract stream Network. The extracted stream network is overlapped with RTK GPS field positioned stream network i.e. a polyline format data. To estimate the exactness of the stream extraction methods, the polyline format is converted in raster format. That allows to compute for each pixel of the observed stream network, the distance to the extracted stream network. Then, for each pixel the mean distance can be calculated, and can be represented through the stream network. LiDAR technology is becoming useful for environment modeling because of his accuracy. Such quantity of data is not free of errors. This research will allow us to estimate the uncertainty of stream network modeled from agricultural watersheds by considering the main sources of errors that are propagated through computing processes. [less ▲]

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See detailL'évaluation environnementale, pour qui, pourquoi, comment ?
Debouche, Charles ULg

in CRA-W (Ed.) 10ème Journée des Productions porcines et avicoles: vers plus de durabilité (2010, October 13)

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See detailLa mesure de l'exactitude d'un récepteur GPS
Debouche, Charles ULg; Berghmans, Katia ULg; Claustriaux, Jean-Jacques ULg

in XYZ (2008), 115

A method is proposed to determine the accuracy of a GPS receiver. This accuracy consists of the trueness of the receiver (absence of systematic error) and its precision (effect of unavoidable accidental ... [more ▼]

A method is proposed to determine the accuracy of a GPS receiver. This accuracy consists of the trueness of the receiver (absence of systematic error) and its precision (effect of unavoidable accidental errors). This method consists in using the GPS receiver to perform, at different dates, the measurement of coordinates of some stations of known coordinates. The discrepancies between the coordinated measured and the “known” coordinates of these stations are submitted to an two-way analysis of variance. This one permits to verify if accidental errors are or not independent of the dates and stations of measurement. Th results of this analysis of variance allow the value the precision of the receiver therefore. The also [less ▲]

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See detailConventional Versus Alternative Pig Production Assessed By Multicriteria Decision Analysis
Degre, Aurore ULg; Debouche, Charles ULg; Verheve, Didier

in Agronomy for Sustainable Development (2007), 27(3),

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See detailAppréhender le caractère durable des systèmes agraires
Stilmant, Didier ULg; Jamar, Daniel; Debouche, Charles ULg et al

in Proceeding des dixième carrefour des productions animales (2005, January 26)

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See detailEvaluation environnementale de l'exploitation agricole: La méthode de l'écobilan
Debouche, Charles ULg; Lambin, Jean

in Travaux & Innovations (2004), (109), 20-22

Les principes du développement durable couvrent les domaines social, économique, et environnemental. En conséquence, l’analyse de la « durabilité » d’une exploitation agricole implique que soient évaluées ... [more ▼]

Les principes du développement durable couvrent les domaines social, économique, et environnemental. En conséquence, l’analyse de la « durabilité » d’une exploitation agricole implique que soient évaluées ses caractéristiques dans ces trois domaines. Est ici présentée une évaluation environnementale de l’exploitation agricole, qui doit évidemment être complétée par son analyse sociale et économique, non couverte par l’écobilan présenté ci-dessous. Cette méthode originale est issue d’une recherche appliquée réalisée par la Faculté universitaire des Sciences agronomiques de Gembloux (Belgique). [less ▲]

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See detailLe bilan azoté dans les exploitations porcines wallonnes : entre contraintes environnementales et qualité différenciée.
Degre, Aurore ULg; Verheve, Didier; Debouche, Charles ULg

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2004), 8(2), 119-124

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See detailCommunication, positionnement et GPS
Debouche, Charles ULg

in Journal des Ingénieurs (Le) (2003), 87

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See detailEquilibre Agriculture-Environnement: Enjeux, outils et perspectives du conseil agricole. Actes du séminaire
Fagroud, M.; Debouche, Charles ULg; Debbarh, Abdelhafid et al

Book published by ENA et FUSAGx (2003)

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See detailComparaison d'huile moteur ACEA E3 et ACEA E4 sur des bus: Hypothèses de travail et interprétation des résultats
Novak, Marie Hélène; Engalytcheff, A.; Etienne, J.-P. et al

Report (2003)

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See detailCommunication, positionnement et GPS
Debouche, Charles ULg

in Journal des Ingénieurs (Le) (2003), (87), 2-31

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See detailEcoFerme: un logiciel d'évaluation environnementale de l'exploitation agricole
Debouche, Charles ULg

in Les Nouvelles de l'été (2003), (3e trimetre), 14-15

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See detailVers l'élaboration d'un modèle d'ecobilan pour l'évaluation environnementale de l'agriculture au Maroc: Cas du périmètre irrigué du Tadla
Debouche, Charles ULg; Krim, LHassan

in Debouche, Charles; Fagroud, Mustapha; Debbarh, Abdelhafid (Eds.) et al Equilibre Agriculture-Environnement: Enjeux, outils et perspectives du conseil agricole (2003)

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See detailDes principes du développement durable à l'écobilan de l'exploitation agricole
Debouche, Charles ULg

in Fagroud, Mustapha; Debouche, Charles; Debbarh, Abdelhafid (Eds.) et al Equilibre Agriculture-Environnement : Enjeux, outils et perspectives du conseil agricole (2003)

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